Finding the Fourth Proportional to 35,781, 53,664.12 and 20,778.72

Step by Step Solution

1. Step 1: Write the proportion equation
   35,781 : 53,664.12 = 20,778.72 : x
2. Step 2: Convert to fraction form
   35,781/53,664.12 = 20,778.72/x
3. Step 3: Cross multiply
   35,781x = 53,664.12 × 20,778.72
4. Step 4: Simplify right side
   35,781x = 1,115,071,723.53
5. Step 5: Solve for x
   x = 1,115,071,723.53/35,781
6. Step 6: Final answer
   x = 31,163.79